Year	%
1988	19.92692
1989	19.82393
1990	20.70909
1991	21.09525
1992	21.82608
1993	21.10551
1994	21.55904
1995	25.32895
1996	27.00101
1997	24.32491
1998	22.74358
1999	23.80952
2000	22.87207
2001	22.77237
2002	23.75642
2003	23.98119
2004	24.32842
2005	24.16673
2006	25.5092
2007	25.20298
2008	25.0102
2009	25.47043
2010	24.60505
2011	27.12906
2012	25.7997
2013	18.9545
2014	27.63286
2015	26.11097
2016	27.16157
2017	30.72602
2018	29.71416
2019	26.61177
2020	25.47803
2021	25.08456